Security readout for executives and security teams
Plain-English summary
Huawei reports a high-severity video framework flaw in HarmonyOS and EMUI. A successful attack could crash or disrupt affected devices, creating an availability risk rather than confirmed data theft or tampering.
Executive priority
Treat as a high-priority device hygiene issue where affected Huawei devices support business operations. Urgency is driven by remote, unauthenticated availability impact, not by confirmed active exploitation in the provided sources.
Technical view
CVE-2021-46881 is described as memory overwriting caused by an addition overflow in the video framework. CVSS 3.1 is 7.5: network attack vector, low complexity, no privileges, no user interaction, and high availability impact only.
Likely exposure
Exposure is limited to Huawei HarmonyOS 2.1.0, 2.0.1, 2.0.0 and EMUI 12.0.1, 12.0.0, 11.0.0, 10.1.1, 10.1.0 systems.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates remote, unauthenticated, low-complexity exploitation potential affecting availability, but no exploit mechanics are provided.
Researcher notes
The public description is sparse. It identifies addition overflow leading to memory overwrite in the video framework and maps to CWE-120. The sources do not provide root-cause detail, proof of exploitation, or fixed-version mapping.
Mitigation direction
- Check Huawei's May 2023 security bulletin for fixed build guidance.
- Update affected HarmonyOS and EMUI devices using Huawei-supported update channels.
- Prioritize internet-connected or business-critical devices running listed versions.
- Where updates are unavailable, reduce exposure to untrusted video processing paths.
- Monitor vendor advisories for revised affected-version or remediation details.
Validation and detection
- Inventory Huawei devices and record HarmonyOS or EMUI version numbers.
- Compare device versions against the affected versions listed for CVE-2021-46881.
- Verify installed security updates align with Huawei's May 2023 bulletin guidance.
- Confirm no business-critical devices remain on affected versions.
- Track unexpected device crashes or video-framework availability symptoms.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-120: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-46881 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://consumer.huawei.com/en/support/bulletin/2023/5/CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.